Now that is a very interesting question! And I also find the similarity between them.
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Darek WędrychowskiApr 7 '13 at 0:58

1

Given all the green foliage behind your son, I'd say it was probably taken in a city park somewhere in a temperate climate. Most likely it was about an hour before sundown. ;-)
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T.E.D.♦Apr 7 '13 at 2:11

This way, your man is called Balthasar Brandmayer. But it turns out that he's not just "some random soldier sitting next to Hitler" as we could think.

In fact, he's an author of a book called "Two messengers" which was released in 1932. It speaks about the times of his war service and frequently refers to Hitler. I don't know if it was translated into English, but...

Awesome answer! Thanks so much. My internet search for the answer earlier yielded nothing. I was overjoyed to see such a detailed and well-documented answer. Here's the back story to how I found the picture. My son's friend in high school saw the picture in one of his classes and though the soldier setting next to Hitler in WW I looked a lot like him. My son showed the picture to family and we all agreed. Since there is some German heritage in him, we thought there might be some relation.
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please delete meApr 7 '13 at 21:35

@DougDomeny I'd argue it's a fairly common type e.g. in the Alpine regions of Germany, Austria, and Italy: for instance, this could also be a relative of your son as pictured :)
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DruxApr 8 '13 at 8:25